Update: According to Judge William Storey, Travis Fox, who was charged in March with killing his two sons, pleaded guilty to charges of first-degree murder Monday morning. Fox was sentenced to life in prison without parole.

A probable cause affidavit from the Washington County Sheriff's Office said Springdale police were called to Northwest Medical Centerin March after a 7-month- old child died.

Fox told Springdale detectives that he violently shook the child for several minutes because he was "fussing." According to probable cause report, Fox told investigators he drank five beers and was intoxicated Wednesday.

The Washington County Deputy Coroner said he recognized the family name and recalled a similar suspicious infant death that happened in September 2011. He notified police.

Detectives said when they questioned Fox about the death of his 6-month old son in 2011, he admitted to also shaking the child and told them he was intoxicated during both incidents.

In the report when questioned about the incident in 2011, Fox told detectives he was drinking tequila and he "tossed his child on the chair" after violently shaking the 6-month-old.